What is the usual pressure setting for a pressure relief valve installed on a reciprocating compressor using R12?

The usual pressure setting for a pressure relief valve installed on a reciprocating compressor using R12 is determined by the design pressure of the system. It is crucial for the relief valve to be set in accordance with the maximum allowable working pressure (MAWP) as specified in the design documents. This ensures that the valve will function correctly to protect the system from overpressure situations.

By setting the relief valve to the design pressure, you ensure that it opens at the right moment during an overpressure event, preventing potential damage to the compressor and other associated equipment. Additionally, the design pressure takes into account the specific characteristics of the refrigerant being used, such as R12, and the operational conditions of the compressor, allowing for safe and efficient system operation.

Choices relating to lower, higher than operating pressure, or ambient pressure settings do not align with safety standards and operational requirements for pressure relief valves in refrigerant systems, as these could compromise the system's integrity or fail to provide necessary protection.